CODEWITHSUNDEEP
phpmysql
Hend
Hend

Reputation: 599

MySQL - Updating values in row while keeping primary key

Scenario:

I have got a client, php script and a MySQL database. I am sending information from the client to the database which the values include the name and favorite color. I have got 2 rows in MySQL database.

Name | Favorite Color

Johnny | Green

Where Name is a primary key.

Every time, the client would be sending both his name and favorite color. So if name (primary key) exist, it shows error. How should I set my php script to react if the client wants to update his favorite color? In other words, keep primary key but update favorite color.

script.php

<?php
mysql_connect("localhost","root","")
mysql_select_db("Information");

$name = mysql_real_escape_string($_POST["name"]);
$color = mysql_real_escape_string($_POST["color"]); 

$sql=mysql_query("insert into Male (name, color) VALUES ('$name','$color')"); 

mysql_close();

Upvotes: 2

Views: 1971

Answers (4)

miku
miku

Reputation: 188114

You are looking for the UPDATE SQL statement. This will update an existing row:

$sql = mysql_query("UPDATE Male SET color = '$color' WHERE name = '$name'");

Alternatively you can use INSERT ... ON DUPLICATE KEY UPDATE.

If you specify ON DUPLICATE KEY UPDATE, and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY, an UPDATE of the old row is performed.

$sql = mysql_query("INSERT INTO Male (name, color) VALUES ('$name','$color') 
                    ON DUPLICATE KEY UPDATE color = '$color'");

MySQL offers an SQL extension, namely REPLACE, which will insert a new row, if none exists.

$sql = mysql_query("REPLACE INTO Male (name, color) VALUES ('$name','$color')");

Upvotes: 1

Okan Kocyigit
Okan Kocyigit

Reputation: 13431

<?php
mysql_connect("localhost","root","")
mysql_select_db("Information");

$name = mysql_real_escape_string($_POST["name"]);
$color = mysql_real_escape_string($_POST["color"]); 
$query = mysql_query("select name from Male where name = '$name'");
if(mysql_num_rows($query) > 0) {
  mysql_query("update Male set color='$color' where name='$name'");
} else {
   mysql_query("insert into Male (name, color) VALUES ('$name','$color')"); 
}
mysql.close();
?>

Upvotes: -1

Robert
Robert

Reputation: 3074

You'll want to modify your mysql_query with an update statement instead of insert. Something like this. 

$name = mysql_real_escape_string($_POST["name"]);

$color = mysql_real_escape_string($_POST["color"]); 

$sql=mysql_query("UPDATE Male SET color = '".$color."' WHERE name = '".$name."'"); 

mysql.close();

Upvotes: 0

djot
djot

Reputation: 2947

$sql=mysql_query("INSERT INTO Male (name, color) VALUES ('".$name."', '".$color."')
ON DUPLICATE KEY UPDATE color='".$color."'");

http://dev.mysql.com/doc/refman/5.1/en/insert-on-duplicate.html

Upvotes: 8

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